<!DOCTYPE html>
<html>
  <head>
    <meta name=viewport-size content=700x500>
    <link rel=match href=viewport_percentage_vw_vh_ref.html>
    <style>
      #box {
        background: green;
        height: 42vh;
        width: 50vw;
      }
    </style>
  </head>
  <body>
    <div id="box">
    </div>
  </body>
</html>
